Submitted by gazpachosoupday t3_11zwahk in explainlikeimfive
imamydesk t1_jdfhecq wrote
Reply to comment by _Connor in ELI5: How do the new airplane windows that turn dark using a button work? by gazpachosoupday
It is an electrochromic material, but it's not PDLC. For airplane windows you want to fail-safe to transparency, not opaqueness - so the power on state is the opaque, power off transparent. That way in an emergency if all windows lose power, emergency responders and passengers alike can look through the windows.
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